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Limited-edition Mac Jr Bacon: Made with the all same iconic ingredients (with one less patty), the Mac Jr.is smaller than a Big Mac, but just as tasty and finished with bacon. (RRP: £2.29 – burger only)

Limited-edition Grand Big Mac Bacon: With the same Big Mac much loved ingredients, the Grand Big Macoffers the one-of-a-kind taste you love in a larger size with a bacon addition (RRP: £4.09 – burger only)

It’s the first time the legendary burger has changed in the UK since it was developed in 1968 and McDonald’s says has been “divided” on the addition of bacon when tested in other parts of the world.

Michelle Graham-Clare, head of marketing at McDonald’s UK&I, said: “The customer reaction to our Grand Big Mac and Mac Jr. last year was phenomenal, the love for the iconic Big Mac surpassed all expectations. Which is why I am delighted to introduce bacon to the Big Mac range, a twist on a classic which has sparked debates around the world – is a Big Mac still a Big Mac if you add bacon?”

Whatever side of the fence you sit on, Maccies fans are being urged to join the debate with the social hashtags #NotABigMac or #StillABigMac.

The Big Mac Bacon, Grand Big Mac Bacon and Mac Jr. Bacon are available in restaurants everywhere for a limited time only until March 19.